Add init ddl

.gitignore

@@ -1,3 +1,5 @@
 .env
 main.log
-jysk.db
+*.db
+*.db-shm
+*.db-wal

db.ddl

@@ -0,0 +1,4 @@
+CREATE TABLE price (
+	price int NOT NULL,
+	date date default current_timestamp
+)

db.go

@@ -62,6 +62,60 @@ func (db *DB) Open() error {
 	return nil
 }
 
+func (db *DB) Init(ddl string) error {
+	if !db.Ready {
+		return fmt.Errorf("database not ready")
+	}
+
+	var rows map[string]struct{} = make(map[string]struct{})
+	var expected = map[string]struct{}{
+		"price": {},
+	}
+
+	res, err := db.readConn.Query("SELECT name FROM sqlite_master WHERE type='table';")
+	if err != nil {
+		Error.Printf("%++v", err)
+		return err
+	}
+	defer res.Close()
+	for res.Next() {
+		var name string
+		err := res.Scan(&name)
+		if err != nil {
+			Error.Printf("%++v", err)
+			return err
+		}
+		rows[name] = struct{}{}
+	}
+
+	var needsInit bool
+	for table := range expected {
+		if _, ok := rows[table]; !ok {
+			log.Printf("Table %s not found, initializing", table)
+			needsInit = true
+			break
+		}
+	}
+
+	if !needsInit {
+		log.Printf("Database already initialized")
+		return nil
+	}
+
+	_, err = db.writeConn.Exec(ddl)
+	if err != nil {
+		Error.Printf("%++v", err)
+		log.Printf("%#v", "Rolling back")
+		_, err2 := db.writeConn.Exec("ROLLBACK;")
+		if err2 != nil {
+			Error.Printf("Error rollingback! %++v", err)
+		}
+		return err
+	}
+
+	return nil
+}
+
 func (db *DB) Close() error {
 	err := db.writeConn.Close()
 	if err != nil {

main.go

@@ -9,6 +9,7 @@ import (
 	"regexp"
 	"strconv"
 	"time"
+	_ "embed"
 
 	"github.com/PuerkitoBio/goquery"
 )
@@ -38,6 +39,9 @@ var priceRegex = regexp.MustCompile(`\d+`)
 
 const url = "https://jysk.hr/spavaca-soba/madraci/madraci-s-oprugama/madrac-s-oprugama-140x200-gold-s110-dreamzone"
 
+//go:embed db.ddl
+var ddl string
+
 func main() {
 	db := DB{path: "jysk.db"}
 	err := db.Open()
@@ -46,6 +50,11 @@ func main() {
 		return
 	}
 	defer db.Close()
+	err = db.Init(ddl)
+	if err != nil {
+		Error.Fatalf("Error initializing database: %v", err)
+		return
+	}
 
 	price := Price{
 		Price:     100,